The Maine accents by the regulars on Murder, She Wrote make Mainers wince. The biggest offender was Tom Bosley's Sheriff Amos Tupper. If you want to learn how to talk with a heavy-duty Maine accent, check out Tim Sample.
Even the murders in Cabot Cove weren't very Maine. Not that we actually have very many murders in Maine, and certainly not many that are at all mysterious. Still, I'd expect something more in the spirit of Maine life. If I were to dream up a Maine murder scenario, I'd want it to have that certain downeast flavor.
Maine Crime Writers blog, by the way), real-life Maine has a murder rate of two per 100,000. I don't have to flinch whenever I hear a chain saw start up, or lock my doors if I hear that Angela Lansbury has crossed the state line.